This year's World Heritage Day - celebrating international monuments and sites - is under the theme of sustainable tourism.

There are over 400 heritage sites in Europe of the over 1000 worldwide. Worldwide, 55 heritage sites are currently in danger.

The World Heritage Day aims to raise awareness of the importance of protecting and preserving heritage sites around the world. During the day many activities inform about the sites, their vulnerability and what goes into conserving and protecting them.